Self-adaptive LED (light emitting diode) fluorescent lamp

Abstract

The invention discloses a self-adaptive LED (light emitting diode) fluorescent lamp, comprising a lamp shell, a PCB plate and a lamp head, wherein the lamp shell comprises a lampshade and a radiating body which are buckled with each other; the PCB plate comprises more than one lamp group and a driving control unit; the lamp head is sleeved at two sides of the lamp shell; the LED driving control unit further comprises a voltage detection module, an intelligent switch module and a linear constant-current module; the voltage detection module comprises a first resistor, a second resistor and a first capacitor; the first resistor and the second resistor are connected with two output ends of a rectification filter module and used for dividing voltage; the first capacitor is connected in parallel with the second resistor; the intelligent switch module is connected with the common terminal of the first resistor and the common terminal of the second resistor through field effect transistors; the output end of the intelligent switch module is connected with a plurality of LED groups; each LED lamp is connected in series with a compensating resistor; and the linear constant-current module comprises two IC (Integrated Circuit) linear driving chips. According to the self-adaptive LED fluorescent lamp disclosed by the invention, the number of LED lamps which are connected in series is switched through automatically detecting an output voltage, so that an optimal driving efficiency is achieved, therefore the self-adaptive LED fluorescent lamp works normally under any voltage conditions.

Description

technical field [0001] The invention relates to a power supply drive system for a fluorescent lamp, in particular to an adaptive LED fluorescent lamp. Background technique [0002] At present, the driving power supply of fluorescent lamps in the mainstream market is external, or built into the aluminum tube groove. Due to the advantages of high luminous efficiency, energy saving, long life, adjustable brightness, safety and reliability, LEDs are widely used. In the lighting of lamps and lanterns, if it is necessary to change the traditional fluorescent lamp into an LED lamp, the use of an external power supply requires that the original fluorescent lamp holder need to re-modify the incoming line method (due to the difference between the LED driver and the traditional fluorescent lamp driver), which will inevitably lead to LED fluorescent lamps. There are problems of technical difficulty and high replacement cost in the replacement; while fluorescent lamps that emit light at ...

AI Technical Summary

Problems solved by technology

[0002] At present, the driving power supply of fluorescent lamps in the mainstream market is external, or built into the aluminum tube groove. Due to the advantages of high luminous efficiency, energy saving, long life, adjustable brightness, safety and reliability, LEDs are widely used. In the lighting of lamps and lanterns, if it is necessary to change the traditional fluorescent lamp into an LED lamp, the use of an external power supply requires that the original fluorescent lamp holder need to re-modify the incoming line method (due to the difference between the LED driver and the traditional fluorescent lamp driver), which will inevitably lead to LED fluorescent lamps. There are problems of technical difficulty and high replacement cost in the replacement; while fluorescent lamps that emit light at a large angle need to use 1 / 3 aluminum tube, the height of the aluminum tube is very low, and it is unrealistic to build it in the groove of the aluminum tube, so there are drivers built in both sides of the tube head However, the drive scheme with the power supply built into both sides of the tube head is adopted. Due to the limited length of the power supply, there are many deficiencies in power capacity and electrical performance (for example: power cannot be increased, electromagnetic interference, cost, etc.

) For example: Patent No.: 200720181726.5, about "a LED constant current drive circuit", it includes a power module connected to the mains and a lamp group composed of one or more diodes, the feature is: the power module includes sequentially Connected AC input terminal, rectifier circuit, isolation transformer, constant current output circuit, the output terminal of the constant current output circuit is connected to the lamp group, because this kind of power supply can only be connected to the mains voltage, so the constant current drives multiple LED lines to match The performance is poor, and the driving efficiency is the best when the output voltage is slightly higher than the voltage of the LED lamp. However, considering the fluctuation of the voltage in the actual use environment, the efficiency will be too low, or the state of constant current cannot be achieved, and the current fluorescent lamp rectifier has There are many kinds, and the output voltage is high or low. For example, there are rectifiers with 180VAC output and 130VAC output in Japan. This kind of driving circuit is not suitable, which will lead to insufficient driving voltage of LED, resulting in insufficient brightness or no bright effect, reducing the use of safety and longevity

Images